Shallow well self-priming pump



Dec. 23, 1947. c. J. BERGH SHALLOW WELL SELF-PRIMING PUMP Filed March 9, 1945 4 Sheets-Sheet l 4 TTOENE Y Dec. 23, 1947. c. J. BERGH SHALLOW WELL SELF-PRIMING PUMP Filed March 9, 1945 4 Sheets-Sheet 2 Dec. 23, 1947. c. .1. BERGH SHALLOW WELL SELF-PRIMING PUMP 4 Sheets-Sha e: 3

Filed March 9, 1945 H m w TE N m R m w m m H Q C 3 w Dec. 23, 1947. c. J. BERGH 2,433,021

SHALLOW WELL SELFrPRIMING PUMP Filed March 9, 1945 4 Sheets-Sheet 4 83 INVENTOR.

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Arramvay Pmnad Dec. 23, 1947. r

v UNITED STATES PATENT OFFICE SHALLOW WELL SELF-PRIMING PUMP Charles J. Bergh, Racine, Wis., assignor to Jacobsen Manufacturing Company, Racine, Wis.

Application March 9, 1945, Serial No. 581,876 2 Claims. 103-5) The present invention relates to what is commonly called a domestic water system, wherein an impeller or let type pump is connected to the bottom of a pressure tank and a connection is supplied from the tank to. the inlet of the pump so the water in the tank may act as a primer for the pump when the pump is first started.

An object of the present invention is to provide a, unitary injector member adapted to form a simple inexpensive and efllcient direct connection between the pump and tank, the connection being secured to the tank and pump by means of bolts or cap screws and gaskets, so that the connecting member may be easily machined and fitted with a jet and a venturi and easily connected to the pipe which extends into the well.

An important object of the present invention is to provide a device in three separate units'for convenience in manufacturing and shipping.

Another object of the present invention is to provide an impeller pump which can be conveniently driven by an electric motor and positioned with the tank and connecting member in a convenient place which may be remote from the well and whereby a single pipe may be the driven member of the well or extend into a well casing.

Generally stated, objects of the present invention are to provide a pumping system particularly adapted for domestic use because it can be made at low cost, operated efficiently and is not apt to get out of order after constant use over a period of many years.

To these and other useful ends, my inventionconsists of parts, combinations of parts or their equivalents and mode of operation, as hereinafter described and claimed and shown in the accompanying drawings in which:

Fig. 1 is a plan view of my complete invention, the pressure tank being cut away at its top and shown in section.

Fig. 2 is a sectional view of the pump and injector showing a fraction of the pressure tank and receiving chamber,

Fig. 3 is a bottom view of the injector unit.

Fig. 4 is a bottom view of the pump, illustrating a fraction of the injector unit.

Fig. 5 is an outlet end view of the injector unit.

Fig. 6 is a vertical section of the receiving chamber.

Fig. 7 is a top view of the receiving chamber.

A detailed view or member G is illustrated in Figures 1 and 2 in my copending application, Serial #580,650, filed March 2, 1945, Air charger for jet pumps, which resulted in Patent 2,421,237,

May 27, 1947.

As thus illustrated the motor in its entirety is designated by referencecharacter A, the motor supporting pedestal by reference character B and the pump in its entirety is designated by reference character 0; the injector unit is designated in itsentirety by reference character D; the pressure tank by referencecharacter E; and the receiving chamber by reference character F. I provide an air charger and a pressure controller for the motor, these members are designated in their entireties by reference characters G and H, respectively.

The pump comprises a housing III which is preferably generally circular in horizontal cross section havingat its top a centrally positioned well II, the upper end of the well being machine trued as at l2-I 2, the bottom being shaped as at l3 and having an opening I! which is machine 'trued and extending into a horizontal inlet opening I 5. Surrounding chamber II and near the bottom thereof, I provide an annular chamber l6 which is connected with chamber ll by a narrow annular slit II. This chamber starts from nothing as at or near l8 and gradually increases in size as indicated by an arrow and as shown in Figure 4 and finally terminates in an outwardly directed outlet as at I9.

I provide an impeller 30, the lower end of which may be rotatably mounted in opening I4 and arranged to rotatably clear l3 as at 3|. Member 30 has an inlet opening 32 and a diameter as at 33, which is slightly less than the diameter of opening I2. Inlet 32 suitably merges into a narrow annular slit 34, which registers with member I! and is slightly narrower than member l1; thus when opening I5 is supplied with water and the pump is operated, the water will by centrifugal force be discharged in chamber l6 through slit I]. When member 30 is driven at the proper speed in the direction indicated by arrow in Fig.

Injector member D forms operating connections between receiving chamber F and pump C and is designed and also secured to tank E as follows: Member D is provided with a duct which forms a connection between receiving chamber F and the inlet duct l5 of pump C. I provide a chamber 41 in member D, which registers with pump outlet l9.

Chamber 4! is provided with a partition 48, hav ing a threaded opening as at 49. A duct is formed in the top of member D terminating in an outlet as at 5|. A small chamber 52 is formed by means of a partition 53 having a threaded opening 88 in alignment with threaded opening 88, A nozzle 88 is adapted to be screw threaded into 48 and is shaped as illustrated in Figure 2. A venturi tube BI is screw-threaded into 84. Member BI is shaped as illustrated, its outlet 82 being somewhat larger than its inlet end, the inlet end being curved outwardly forming an annular opening around the outlet end of nozzle 88, the nozzle terminating as at 68 with a suitable size opening so when water is discharged from the opening into member 8| a partial vacuum will be formed in chamber 82.

I provide screw-threaded openings 84-88 which extend into opposite sides of chamber 52. One of these openings may be closed with a pipe plug, the other being suitably connected to inlet pipe 88. which leads to the driven well pipe or the pipe which extends into the well through a driven casing. It will be noted that duct 45 is provided with a drain plug 88 and that duct 80 is provided with a connection 81, which is operatively connected to the motor controlling switch H. Member G is operatively connected to pressure tank E at its top and at about the general water level in the tank and to chamber 52 by means of a tube 88. The operation of members G and H will hereinafter appear.

Chamber 50 is preferably supplied with a screwthreaded opening 69 to which a pressure guage I may be connected for indicating the pressure tank pressure as will hereinafter appear.

I will now describe units E and F. Tank E is open at the bottom as at 88 and closed at its top (not shown) and having a partition 8! forming a closure for the tank. Member 8| is shaped as shown in Figure 1 so as to give it strength to resist pressure in the tank. The receiving chamber F is provided with a flanged opening 82, which registers with duct 45. Duct 45 and opening 82 are adapted to receive the Venturi tub 8| as illustratea in Figure 2. Flange 88 extends freely through an opening 84 in the side wall of tank E. Member D is supplied with flanges 88--88, each flange being suitably reinforced and secured to flanges 88 and 85 by means of bolts 8'|8'| and gaskets 88-88. Receiving chamber F is provided with flanges 9l--9l which rest against the inside Wall of tank E and are secured thereto by means of bolts 92; thus when member D is secured to members C and F and member F is secured to member E a firmly held together assembly will be provided.

Tank E is adapted to rest on a plank floor or a concrete foundation; in either event the weight of members A, B and C may be made to rest on the tank support by means of a pair of legs 95, having screw-threaded into their-bottoms, cap screws 98 with a suitable locking nut. Member F is relatively small and preferably cast iron or cast steel having a duct 91 which registers at one end with opening of duct 50. The inner end of duct 91 is provided with a fitting 98 which is suitably secured to member 8i as .illustrated in Figure 1 so as to provide a passageway from duct 58 to the pressure tank. Fitting 98 is provided with a relatively small opening whereby when the pump is started enough pressure is provided for operating the venturi and thereby create enough vacuum in chamber 52 to draw water from the well.

Itwill be seen because of the fact that the receiving chamber F is relatively small and member E is opened at the bottom, plenty of room is supplied for securing member F to the wall of the 4 tank and for securing fitting 88 to pressure tank bottom 8|.

By scrutinizing the various features it will be seen that the inJector will draw water from the inlet pipe 88 and force it into the receiving chamber F through the Venturi tube 8 I that the water discharged into member F will flow into the suction inlet of pump C through ducts i8 and 48 and that the surplus water will be discharged into the pressure tank through ducts 50 and 81, that all of thespace within receiving chamber F, the injector and the pump will at all times be kept full of water because of the connection of ducts 91, 80 and 41 to the pressure tank. Therefore immediately the pump reaches operating speed the injector will act to draw water from the well, the surplus pumped being discharged into the pressure tank.

Thus member H being connected to duct 80 will cause the motor to operate when the pressure in the pressure tank falls below or raises above a predetermined pressure. The operation of member G is too well known to require detailed description. For the present it may be stated that since member G is operatively connected to chamber 52, it will be operated by the vacuum in this chamber. A valve in member G is adapted to be opened when the water in this member reaches a predetermined height caused by the water in the pressure tank flowing into member G when above its connection to the tank and whereby when the water level in member G falls below a predetermined point the valve will be closed.

It will be seen that applicant has provided a simple, eflicient, automatic economic domestic pumping unit for shallow wells, which will at all times be self priming.

Clearly many minor detail changes may be made in the design shown without departing from the spirit and scope in my invention as recited in the appended claims.

Having thus shown and described my invention '1 claim:

1. In a self priming device of the character described, comprising an impeller pump having driving means therefor, a pressure tank having its bottom closure a distance from the bottom of the wall of the tank forming an open chamber, a relatively small receiving chamber in said open chamber, an injector forming an operating connection between said pump and receiving chamber, a passageway from said receiving chamber to the inlet of said pump and a passageway from the outlet of said pump to said tank, said injector having a receiving chamber adapted to be connected to a well and being associated with the nozzle of said injector, the bottom of said tank being positioned above the pump and its inlet and outlet connections, whereby the connections and pump will at all times be supplied with water from the tank for priming purposes and whereby when the pump has reached an operating speed, water will be discharged conjointly into the receiving chamber and pressure tank, said receiving chamber extending freely through an opening in the wall of the pressure tank, the injector forming a rigid connection between the pump and receiving chamber, said receiving chamber having surfaces adapted to contact the wall of the tank on opposite sides of the opening therein and being rigidly secured to the wall.

2 A self priming device of the character described, comprising an impeller pump having driving means therefor, an injector unit detachably connected to the outlet and inlet side of said pump by means of flat gasketed surfaces and bolts, a pressure tank having its bottom closure positioned a distance above the bottom of the wall of the tank forming an open chamber having an opening in its wall, a relatively small receiving chamber having a flat surface which registers with said opening and being detachably' secured to the other end of said injector unit by means of a gasket and bolts, said receiving chamber havclosure of said pressure tank and near the center thereof, an injector suction chamber through which the injector nozzle extends and having an inlet connection adapted to be connected to a well pipe and a venturi adjacent the outlet end of said nozzle-having an outlet into said receiving chamber, a duct in said injector unit leading from the receiving chamber to the inlet of said pump.

CHARLES J. BERGH.

REFERENCES CITED The following references are of'record in the file of this patent:

UNITED STATES PATENTS Number Name Date 477,381 OBrien June 21, 1892 801,161 Schutte et a1 Oct. 3, 1905 2,172,097 Burks Sept. 5, 1939 2,270,994 Cole Jan. 27, 1942 2,354,811 Jacuzzi Aug. 1, 1944 

